package _11_整理题目._6_模拟设计;

import org.junit.Test;

import java.util.Stack;

/**
 * 
 * 
 */
public class _10_用两个栈实现队列 {
    Stack<Integer> stack1 = new Stack<Integer>();
    Stack<Integer> stack2 = new Stack<Integer>();
    
    public void push(int node) {
        stack1.push(node);
    }
    
    public int pop() {
        if(!stack2.isEmpty()) {
            return stack2.pop();
        } else {
            if(!stack1.isEmpty()) {
                while(!stack1.isEmpty()) {
                    stack2.push(stack1.pop());
                }
                return stack2.pop();
            } else {
                return -1;
            }
        }
    }
    
    @Test
    public void main() {
        
    }
}
